Gas Permeation Properties, Physical Aging, and Its Mitigation in High Free Volume Glassy Polymers,Chemical Reviews

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Gas Permeation Properties, Physical Aging, and Its Mitigation in High Free Volume Glassy Polymers
Chemical Reviews ( IF 51.4 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1021/acs.chemrev.7b00629
Ze-Xian Low ₁ , Peter M. Budd ₂ , Neil B. McKeown ₃ , Darrell A. Patterson ₁

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Hundreds of polymers have been evaluated as membrane materials for gas separations, but fewer than 10 have made it into current commercial applications, mainly due to the effects of physical aging and plasticization. Efforts to overcome these two problems are a significant focus in gas separation membrane research, in conjunction with improving membrane separation performance to surpass the Robeson upper bounds of selectivity versus permeability for commercially important gas pairs. While there has been extensive research, ranging from manipulating the chemistry of existing polymers (e.g., thermally rearranged or cross-linked polyimides) to synthesizing new polymers such as polymers of intrinsic microporosity (PIMs), there have been three major oversights that this review addresses: (1) the need to compare the approaches to achieving the best performance in order to identify their effectiveness in improving gas transport properties and in mitigating aging, (2) a common standardized aging protocol that allows rapid determination of the success (or not) of these approaches, and (3) standard techniques that can be used to characterize aging and plasticization across all studies to enable them to be robustly and equally compared. In this review, we also provide our perspectives on a few key aspects of research related to high free volume polymer membranes: (1) the importance of Robeson plots for membrane aging studies, (2) eliminating thermal history, (3) measurement and reporting of gas permeability and aging rate, (4) aging and storing conditions, and (5) promising approaches to mitigate aging.

中文翻译：

高自由体积玻璃态聚合物中的气体渗透特性，物理老化及其缓解

数百种聚合物已被评估为用于气体分离的膜材料，但由于物理老化和塑化的影响，目前只有不到10种聚合物进入了商业应用。克服这两个问题的努力是气体分离膜研究的重要重点，同时要提高膜分离性能，以超越具有重要商业意义的气体对的Robeson选择性对渗透率的Robeson上限。尽管已经进行了广泛的研究，从操纵现有聚合物（例如，热重排或交联的聚酰亚胺）的化学反应到合成新的聚合物（例如固有微孔性（PIM）的聚合物），但该审查涵盖了三个主要方面：（1）需要比较达到最佳性能的方法，以便确定其在改善气体传输特性和缓解老化方面的有效性，（2）通用的标准化老化协议，可以快速确定成功与否。这些方法，以及（3）可用于表征所有研究中的老化和塑化特性的标准技术，以使它们能够进行稳健而均等的比较。在这篇评论中，我们还提供了与高自由体积聚合物膜相关的一些关键研究方面的观点：（1）Robeson图对膜老化研究的重要性；（2）消除热历史；（3）测量和报告气体渗透率和老化率，（4）老化和储存条件，以及（5）缓解老化的有前途的方法。

更新日期：2018-05-08

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